Slightly different system, but let me spin you a tale here.
I loved teaching. The sheer joy of seeing someone "get it" got me up in the morning and got me through the day in a tough inner city school. Lots of crap, lots of shit, all ignorable for that look in a kid's eyes when they finally understand something - be it the laws of thermodynamics or valences or "Mix this with this and it goes boom and this is why."
So, why haven't I taught in 15 years? Because for the 4 years preceding my quitting, I was not teaching. I was ticking boxes and filling out forms. I had a full class load - 36 hours per week. Another 40 hours a week doing the obligatory paperwork. I never signed up to do paperwork. I wanted to teach. Not just my subjects, but a little about life and a little about tolerance and a little bit about fun.
Instead of looking at each student as a person, with their own needs and interests, I was looking at them as boxes to be ticked, grades to be obtained and assets to be kept. Not for me. Sorry. Anything that depersonalizes a person into a pigeonhole is something I detest.
My very first day on the job - I remember it well. Some stroppy kid pulled a blade on me in the hallway. Told him to put it away before it went up his ass. He, oddly, turned out to be one of my best students and someone I am still proud of 25 years later. We keep in touch. Went to his wedding.

My first A level class - that was frightening. They were dedicated and - most of them - a hell of a lot smarter than me. 23 of them in the class. 18 of them are now Ph.Ds, or doctors, or lawyers. Two are dead, three are in prison. Not a bad average, over all.